change report filename to "report.json"

app/src/main/java/com/besendorf/androidsecurityscanner/MainActivity.java

@@ -172,7 +172,7 @@ public class MainActivity extends AppCompatActivity {
         }
         reportTextView.setText(sreport);
         //write report to file
-        File output = new File(this.getExternalFilesDir(null), (Build.VERSION.RELEASE+Build.VERSION.INCREMENTAL+".json").replaceAll(" ",""));
+        File output = new File(this.getExternalFilesDir(null), ("report.json"));
         try {
             FileWriter writer;
             writer = new FileWriter(output);